Blender to unity track animations
Try to bake action. With selected all objects, that you need to be animated (so without empties) go to Tool Shelf>Animation>Bake Action, choose Only selected, Visual Keying, Clear Constraints, Clear Parents and Overwrite Current Action. For Bake Data select Object and for End Frame and Start Frame appropriate frames on which your animation starts and ends.Animation, that will be effect of that should be easy exportable to Unity.